Assessment of errors and biases in retrievals of X<sub>CO<sub>2</sub></sub>, X<sub>CH<sub>4</sub></sub>, X<sub>CO</sub>, and X<sub>N<sub>2</sub>O</sub> from a 0.5 cm<sup>–1</sup> resolution solar-viewing spectrometer
Bruker™ EM27/SUN instruments are commercial mobile solar-viewing near-IR spectrometers. They show promise for expanding the global density of atmospheric column measurements of greenhouse gases and are being marketed for such applications. They have been shown to measure the same variation...
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doaj-7847df794d86439496dcb4f76b96f71e2020-11-24T23:10:03ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482016-08-01983527354610.5194/amt-9-3527-2016Assessment of errors and biases in retrievals of X<sub>CO<sub>2</sub></sub>, X<sub>CH<sub>4</sub></sub>, X<sub>CO</sub>, and X<sub>N<sub>2</sub>O</sub> from a 0.5 cm<sup>–1</sup> resolution solar-viewing spectrometerJ. K. Hedelius0C. Viatte1D. Wunch2C. M. Roehl3G. C. Toon4J. Chen5T. Jones6S. C. Wofsy7J. E. Franklin8H. Parker9M. K. Dubey10P. O. Wennberg11Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USADivision of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USADivision of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USADivision of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USAJet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USASchool of Engineering and Applied Sciences and Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, USASchool of Engineering and Applied Sciences and Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, USASchool of Engineering and Applied Sciences and Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, USADepartment of Physics & Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, CanadaEarth and Environmental Sciences, Los Alamos National Laboratory, Los Alamos, NM, USAEarth and Environmental Sciences, Los Alamos National Laboratory, Los Alamos, NM, USADivision of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USABruker™ EM27/SUN instruments are commercial mobile solar-viewing near-IR spectrometers. They show promise for expanding the global density of atmospheric column measurements of greenhouse gases and are being marketed for such applications. They have been shown to measure the same variations of atmospheric gases within a day as the high-resolution spectrometers of the Total Carbon Column Observing Network (TCCON). However, there is little known about the long-term precision and uncertainty budgets of EM27/SUN measurements. In this study, which includes a comparison of 186 measurement days spanning 11 months, we note that atmospheric variations of X<sub>gas</sub> within a single day are well captured by these low-resolution instruments, but over several months, the measurements drift noticeably. We present comparisons between EM27/SUN instruments and the TCCON using GGG as the retrieval algorithm. In addition, we perform several tests to evaluate the robustness of the performance and determine the largest sources of errors from these spectrometers. We include comparisons of X<sub>CO<sub>2</sub></sub>, X<sub>CH<sub>4</sub></sub>, X<sub>CO</sub>, and X<sub>N<sub>2</sub>O</sub>. Specifically we note EM27/SUN biases for January 2015 of 0.03, 0.75, –0.12, and 2.43 % for X<sub>CO<sub>2</sub></sub>, X<sub>CH<sub>4</sub></sub>, X<sub>CO</sub>, and X<sub>N<sub>2</sub>O</sub> respectively, with 1<i>σ</i> running precisions of 0.08 and 0.06 % for X<sub>CO<sub>2</sub></sub> and X<sub>CH<sub>4</sub></sub> from measurements in Pasadena. We also identify significant error caused by nonlinear sensitivity when using an extended spectral range detector used to measure CO and N<sub>2</sub>O.http://www.atmos-meas-tech.net/9/3527/2016/amt-9-3527-2016.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
J. K. Hedelius C. Viatte D. Wunch C. M. Roehl G. C. Toon J. Chen T. Jones S. C. Wofsy J. E. Franklin H. Parker M. K. Dubey P. O. Wennberg |
spellingShingle |
J. K. Hedelius C. Viatte D. Wunch C. M. Roehl G. C. Toon J. Chen T. Jones S. C. Wofsy J. E. Franklin H. Parker M. K. Dubey P. O. Wennberg Assessment of errors and biases in retrievals of X<sub>CO<sub>2</sub></sub>, X<sub>CH<sub>4</sub></sub>, X<sub>CO</sub>, and X<sub>N<sub>2</sub>O</sub> from a 0.5 cm<sup>–1</sup> resolution solar-viewing spectrometer Atmospheric Measurement Techniques |
author_facet |
J. K. Hedelius C. Viatte D. Wunch C. M. Roehl G. C. Toon J. Chen T. Jones S. C. Wofsy J. E. Franklin H. Parker M. K. Dubey P. O. Wennberg |
author_sort |
J. K. Hedelius |
title |
Assessment of errors and biases in retrievals of X<sub>CO<sub>2</sub></sub>, X<sub>CH<sub>4</sub></sub>,
X<sub>CO</sub>, and X<sub>N<sub>2</sub>O</sub> from a 0.5 cm<sup>–1</sup> resolution solar-viewing
spectrometer |
title_short |
Assessment of errors and biases in retrievals of X<sub>CO<sub>2</sub></sub>, X<sub>CH<sub>4</sub></sub>,
X<sub>CO</sub>, and X<sub>N<sub>2</sub>O</sub> from a 0.5 cm<sup>–1</sup> resolution solar-viewing
spectrometer |
title_full |
Assessment of errors and biases in retrievals of X<sub>CO<sub>2</sub></sub>, X<sub>CH<sub>4</sub></sub>,
X<sub>CO</sub>, and X<sub>N<sub>2</sub>O</sub> from a 0.5 cm<sup>–1</sup> resolution solar-viewing
spectrometer |
title_fullStr |
Assessment of errors and biases in retrievals of X<sub>CO<sub>2</sub></sub>, X<sub>CH<sub>4</sub></sub>,
X<sub>CO</sub>, and X<sub>N<sub>2</sub>O</sub> from a 0.5 cm<sup>–1</sup> resolution solar-viewing
spectrometer |
title_full_unstemmed |
Assessment of errors and biases in retrievals of X<sub>CO<sub>2</sub></sub>, X<sub>CH<sub>4</sub></sub>,
X<sub>CO</sub>, and X<sub>N<sub>2</sub>O</sub> from a 0.5 cm<sup>–1</sup> resolution solar-viewing
spectrometer |
title_sort |
assessment of errors and biases in retrievals of x<sub>co<sub>2</sub></sub>, x<sub>ch<sub>4</sub></sub>,
x<sub>co</sub>, and x<sub>n<sub>2</sub>o</sub> from a 0.5 cm<sup>–1</sup> resolution solar-viewing
spectrometer |
publisher |
Copernicus Publications |
series |
Atmospheric Measurement Techniques |
issn |
1867-1381 1867-8548 |
publishDate |
2016-08-01 |
description |
Bruker™ EM27/SUN instruments are commercial mobile solar-viewing near-IR spectrometers. They show promise for expanding the global density of atmospheric column measurements of greenhouse gases and are being marketed for such applications. They have been shown to measure the same variations of atmospheric gases within a day as the high-resolution spectrometers of the Total Carbon Column Observing Network (TCCON). However, there is little known about the long-term precision and uncertainty budgets of EM27/SUN measurements. In this study, which includes a comparison of 186 measurement days spanning 11 months, we note that atmospheric variations of X<sub>gas</sub> within a single day are well captured by these low-resolution instruments, but over several months, the measurements drift noticeably. We present comparisons between EM27/SUN instruments and the TCCON using GGG as the retrieval algorithm. In addition, we perform several tests to evaluate the robustness of the performance and determine the largest sources of errors from these spectrometers. We include comparisons of X<sub>CO<sub>2</sub></sub>, X<sub>CH<sub>4</sub></sub>, X<sub>CO</sub>, and X<sub>N<sub>2</sub>O</sub>. Specifically we note EM27/SUN biases for January 2015 of 0.03, 0.75, –0.12, and 2.43 % for X<sub>CO<sub>2</sub></sub>, X<sub>CH<sub>4</sub></sub>, X<sub>CO</sub>, and X<sub>N<sub>2</sub>O</sub> respectively, with 1<i>σ</i> running precisions of 0.08 and 0.06 % for X<sub>CO<sub>2</sub></sub> and X<sub>CH<sub>4</sub></sub> from measurements in Pasadena. We also identify significant error caused by nonlinear sensitivity when using an extended spectral range detector used to measure CO and N<sub>2</sub>O. |
url |
http://www.atmos-meas-tech.net/9/3527/2016/amt-9-3527-2016.pdf |
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